Abstract
Summary form only given. Making sound security decisions when designing, operating, and maintaining a complex system is a challenging task. Analysts need to be able to understand and predict how different factors affect overall system security. During system design, security analysts want to compare the security of multiple proposed system architectures. After a system is deployed, analysts want to determine where security enhancement should be focused by examining how the system is most likely to be successfully penetrated. And when several security enhancement options are being considered, analysts would like to evaluate the relative merits of each. In each of these scenarios, quantitative security metrics should provide insight on system security and aid security decisions. Quantitative metrics enable ranking the alternatives to determine the best option. Quantitative assessments of system security are also valuable for risk management trade-off decisions.
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